( )
438=51 1650=66 809=89
6840=28 2430=54 764=72
=(个)
15
10
7
( )?
54÷9=
5×8=
54+6=
64-8=
7÷7+5=
7×3=
32÷8=
98-80=
18+5=
64-7=
68-60=
11-8=
3+40
35-20=
80-60=
35+7=
52+8=
39+20=
70-5=
62-8=
50+15=
65-20=
48-9=